Balance Sheet Details (Tables)

12 Months Ended

Dec. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Available-for-Sale Securities Recorded at Fair Value with Unrealized Gains or Losses

Available-for-sale securities with contractual maturities of less than 12 months were as follows (in thousands):

	December 31, 2014							December 31, 2013
	Amortized cost basis		Gross unrealized loss			Fair value		Amortized cost basis		Gross unrealized loss			Fair value
Corporate bonds and notes	$	1,000	$	(1	)	$	999	$	919	$	(1	)	$	918
Government securities/money market		1,881		—			1,881		2,160		—			2,160
Total	$	2,881	$	(1	)	$	2,880	$	3,079	$	(1	)	$	3,078

Summary of Equipment and Improvements

Equipment and improvements consist of the following (in thousands):

	December 31,
	2014			2013
Computer hardware, software, and equipment	$	16,143		$	16,529
Leasehold improvements		5,170			5,317
Office furniture and fixtures		1,213			1,213
		22,526			23,059
Less accumulated depreciation and amortization		(18,253	)		(16,036	)
Equipment and improvements, net	$	4,273		$	7,023

Summary of Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

	December 31,
	2014		2013
Salaries and benefits	$	2,779	$	3,651
Restructuring		912		1,978
Pennsylvania grant liability		1,000		1,000
Royalties and revenue sharing		835		803
Income taxes		160		176
Marketing expenses, rebates and other		66		126
Total accrued liabilities	$	5,752	$	7,734

Deferred Rent and Other Long Term Liabilities

Deferred rent and other long term liabilities consist of the following (in thousands):

	December 31,
	2014		2013
Deferred rent	$	1,643	$	1,986
Restructuring - beyond one year		1,977		1,394
Sublease deposits		23		—
Deferred revenue - long term		—		3
Total deferred rent and other long term liabilities	$	3,643	$	3,383